A course of experiments in physical measurement (1897)
Whiting, Harold, d. 1895 · Boston, D.C. Heath and Co. · leaf 55
an body. When the greatest accuracyis desired, the bulb of the thermometer should beprotected froni radiation to or from surroundingobjects, by a shield of polished metal. The humidity of the atmosphere is most conveneiently determined by a class of instruments of whichthe hygrodeik is an example.… … Fig. 13. (a, Fig. 13), its reading differs from that of an oicdi-iiary thennometer (J) ,by an .amount depending uponthe dryness of the air. W^hen the air is completelysa,turat^d with moisture, as in adense fog, there ,i,s ,no evaporationfrom jjhe w;^t bulb, hence the twotherniometers agree; if the…
Physics
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